OSOP Specification

The standard format for describing and logging AI agent workflows.

Two file formats:

• .osop — workflow definition. What should happen, step by step.
• .osoplog — execution record. What actually happened. Timestamps, tool calls, AI reasoning.

OSOP Core (Start Here)

Most users need only OSOP Core — 4 node types, 4 edge modes:

Node Type	Purpose	Example
agent	AI/LLM operations	Claude analyzes code
api	HTTP calls	POST to Slack webhook
cli	Shell commands	npm test
human	Manual steps	User reviews changes

Edge Mode	Behavior
sequential	A then B (default)
conditional	A then B if condition is true
parallel	A and B simultaneously
fallback	B only if A fails

Quick Start

pip install osop

# Validate a workflow
osop validate workflow.osop.yaml

# Validate against Core schema only
osop validate --schema core workflow.osop.yaml

# Render as Mermaid diagram
osop validate workflow.osop.yaml

What a .osop File Looks Like

osop_version: "1.0"
id: "ai-code-review"
name: "AI Code Review"
tags: [ai-agent, code-review]

nodes:
  - id: "fetch-diff"
    type: "api"
    name: "Fetch PR Diff"
    runtime:
      method: "GET"
      url: "https://api.github.com/repos/org/repo/pulls/42/files"

  - id: "review"
    type: "agent"
    name: "AI Reviews Code"
    runtime:
      provider: "anthropic"
      model: "claude-sonnet-4-20250514"

  - id: "approve"
    type: "human"
    name: "Developer Reviews"

edges:
  - from: "fetch-diff"
    to: "review"
  - from: "review"
    to: "approve"

What a .osoplog File Looks Like

osoplog_version: "1.0"
run_id: "a1b2c3d4"
workflow_id: "ai-code-review"
status: "COMPLETED"
started_at: "2026-04-04T10:00:00Z"
ended_at: "2026-04-04T10:05:32Z"
duration_ms: 332000

runtime:
  agent: "claude-code"
  model: "claude-opus-4-6"

node_records:
  - node_id: "fetch-diff"
    status: "COMPLETED"
    duration_ms: 1200
  - node_id: "review"
    status: "COMPLETED"
    duration_ms: 28000
    ai_metadata:
      model: "claude-sonnet-4-20250514"
      prompt_tokens: 3200
      completion_tokens: 850

result_summary: "AI reviewed PR #42: 3 issues found."

Ecosystem

Tool	What
osop	Python CLI — validate, render, run, diff
osop-mcp	MCP server (4 tools for Claude/Cursor/Windsurf)
osop-editor	Visual editor with risk analysis
osop-examples	Workflow templates
osop-vscode	VS Code extension

Documentation

Document	Description
OSOP Core	Core spec — 4 types, 4 modes (start here)
Full Spec	Complete protocol (12 types, 10 modes)
Node Types	All types with examples
Conformance	L0–L3 adoption levels

Schema Files

File	Purpose
schema/osop-core.schema.json	Core schema (recommended)
schema/osop.schema.json	Full schema (all types)
schema/osoplog.schema.json	Execution log schema

Contributing

See CONTRIBUTING.md. We welcome protocol proposals via RFC, new examples, and documentation improvements.

License

Apache License 2.0